TM 9-4120-402-14
CHAPTER 4
UNIT MAINTENANCE INSTRUCTIONS
Paragraph
Unit Lubrication .........................................................................................................................................
Section II Repair Parts, Special Tools, Test, Measurement, and Diagnostic
Equipment (TMDE), and Support Equipment
General .....................................................................................................................................................
Site and Shelter Requirements ..................................................................................................................
Service Upon Receipt of Material .............................................................................................................
Installation Instructions .............................................................................................................................
Input Power Cable ....................................................................................................................................
Section IV Unit Preventive Maintenance Checks and Services (PMCS)
Introduction, Inspection and Service ..........................................................................................................
Use of Troubleshooting Table ....................................................................................................................
General .....................................................................................................................................................
Fabric Cover .............................................................................................................................................
CBR (Chemical, Biological, Radiological) Duct Cover ................................................................................
Access (Service Valves) Cover .................................................................................................................
Connector Cover Plates .............................................................................................................................
Conditioned Air Discharge (Outlet) Grille Assembly ..................................................................................
Conditioned Air Intake Grille Assembly .....................................................................................................
Condenser (Fan) Guard .............................................................................................................................
Condenser Coil Guard ...............................................................................................................................
Fresh Air (Inlet) Screen or Cover ..............................................................................................................
Top Panel ..................................................................................................................................................
Lower Front Cover .....................................................................................................................................
Filter (Radio Frequency) Mounting Plate ....................................................................................................
Rear Panel ...............................................................................................................................................
Conditioned Air Filter .................................................................................................................................
Fresh Air Filter ..........................................................................................................................................
Mist Eliminator ..........................................................................................................................................
Electrical Wiring Repair- General ..............................................................................................................
Control Panel ............................................................................................................................................
Wiring Harness, Control Panel ...................................................................................................................
Potentiometer (Temperature Control) (R1) ................................................................................................
Mode Selector Rotary Switch (S1) .............................................................................................................
Fault Indicator, Light Emitting Diode (DS1, DS2, DS3, and DS4) ..............................................................
Electromagnetic Interference Filter (FL1) ..................................................................................................
Coil Frost Switch (S2) ...............................................................................................................................
Control Assembly ......................................................................................................................................
Control Assembly Wiring Harnesses ..........................................................................................................
Logic Box Assembly (LGC1) ......................................................................................................................
Motor Controller Assembly (MC1) ..............................................................................................................
Rectifier (CR1) and Capacitors (C1 and C2) .............................................................................................
Transformer (T) .........................................................................................................................................
Compressor Start Relay (K2), Diode (CR3), and Surge Arrestor (SA1) ......................................................
Heater Relay (K1) and Diode (CR2) ..........................................................................................................
Rectifier (CR4) ..........................................................................................................................................
Circuit Breaker (CB1).................................................................................................................................
Electric Heater Elements (HR1 through HR6) ............................................................................................
Heater Cutout (Thermostat) Switch (S4) ...................................................................................................
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